http://www.transperth.wa.gov.au/Portals/0/Asset/Documents/Special Events/Stadium/Getting to and from Stadium.pdf
The two direct bus routes from Fremantle and Hamilton Hill stop at Canning Bridge station. If you're intending to drive to Murdoch station it may be quicker to drive to Canning Bridge and take the bus.
... or park at Garden City and catch the Hamilton Hill bus from there.